Determination method of regenerative work ratio and regenerative gain rate when non-reheat unit has heater heat dissipation loss

A technology of non-reheat unit and regenerative work ratio, which is applied in the field of soft measurement and can solve problems such as failure and heat dissipation loss of heaters

CN104484568BActive Publication Date: 2018-06-05SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-06-05

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Abstract

The invention discloses a method for measuring the regenerative work ratio and regenerative gain rate of a non-reheat unit when there is heat loss from a heater. The non-reheat unit is composed of one cylinder, and its three-stage steam extraction is sequentially numbered as the first stage, The second and third stages extract steam and are connected to the first, second and third stage heaters respectively. The first stage heater is a surface heater, and its water discharges to the second stage heater. The second stage heater is a hybrid heater, and the third stage heater is a surface heater, and its water drains to the hot well of the condenser. When the non-reheat unit has heat loss from the heater, the heat recovery work ratio and heat recovery gain The measurement steps of the rate are as follows: Obtain the dimensionless heat rate of the reheating cycle without recuperation, the work done by the equivalent reheated steam flow and the equivalent work done by the condensed steam flow; Work ratio and heat recovery gain rate. The measuring method of the invention realizes the high-precision and low-cost soft measurement of the regenerative work ratio and the regenerative gain ratio.
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Description

technical field

[0001] The invention relates to a method for measuring the regenerative work ratio and the regenerative gain rate when the non-reheating unit has heat dissipation loss of the heater, which can realize the regenerative work ratio and the recuperation rate when the non-reheating unit has the heat dissipation loss of the heater The determination of the gain rate belongs to the field of soft measurement. Background technique

[0002] The heat recovery cycle composed of heaters is an important part of the reheat unit, and the heat recovery effect is one of the main factors affecting the thermal efficiency of the reheat unit. The main technical indicators for evaluating the heat recovery effect are heat recovery work ratio and heat recovery gain rate. Among them, the regenerative work ratio refers to the proportion of the work done by the regenerative steam flow in the internal work of the steam turbine (the sum of the work done by the regenerative steam flow and ...

Examples

Embodiment Construction

[0085] A method for measuring the regenerative work ratio and regenerative gain rate when a non-reheat unit has heater heat dissipation loss, and its calculation model is aimed at a non-reheat unit with three-stage regen. The steam turbine consists of a cylinder, and its three-stage extraction steam is numbered as the first, second and third extraction steam in sequence, and is connected to the first, second and third heaters respectively. The heater is a surface heater, and its water discharges to the second-stage heater, the second-stage heater is a hybrid heater, and the third-stage heater is a surface heater, and its water discharges to the hot well of the condenser.

[0086] The measurement steps are as follows,

[0087] Step 1: Calculation of steam-water parameters in thermal system

[0088] Step 1.1: Take the relative internal efficiency η of the steam turbine under THA (Turbine Heat Acceptance, heat consumption guaranteed working condition) ri , The pressure loss rat...